package com.yupi.yupicturebackend.manager;


import cn.hutool.core.date.DateUtil;
import cn.hutool.core.io.FileUtil;
import cn.hutool.core.util.NumberUtil;
import cn.hutool.core.util.RandomUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.http.HttpResponse;
import cn.hutool.http.HttpStatus;
import cn.hutool.http.HttpUtil;
import cn.hutool.http.Method;
import com.qcloud.cos.model.PutObjectResult;
import com.qcloud.cos.model.ciModel.persistence.ImageInfo;
import com.yupi.yupicturebackend.config.CosClientConfig;
import com.yupi.yupicturebackend.exception.BusinessException;
import com.yupi.yupicturebackend.exception.ErrorCode;
import com.yupi.yupicturebackend.exception.ThrowUtils;
import com.yupi.yupicturebackend.model.dto.file.UploadPictureResult;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import javax.annotation.Resource;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Arrays;
import java.util.Date;
import java.util.List;

/**
 * 文件已废弃，改用upload包下的模板方法优化
 * @author xiaodi
 * @date 2025/4/4
 * @Description
 */
@Deprecated
@Slf4j
@Service
public class FileManager {
    /**
     * 1 兆
     */
    private static final long ONE_M = 1024 * 1024L;
    private static final List<String> ALLOW_FORMAT_LIST = Arrays.asList("jpeg", "jpg", "png", "webp");
    @Resource
    private CosClientConfig cosClientConfig;
    @Resource
    private CosManager cosManager;

    /**
     * 上传文件
     * @param multipartFile 文件
     * @param uploadPathPrefix 上传路径前置
     * @return
     */
   public UploadPictureResult uploadPicture(MultipartFile multipartFile,String uploadPathPrefix){
       //校验图片
       validPicture(multipartFile);
       //图片上传地址
       String uuid= RandomUtil.randomString(16);
       String originalFilename=multipartFile.getOriginalFilename();
       //自己拼接文件上传路径，而不是使用原始文件名称，可以增加安全性
       String uploadFilename=String.format("%s_%s.%s", DateUtil.formatDate(new Date()),uuid,FileUtil.getSuffix(originalFilename));
       String uploadPath=String.format("/%s/%s",uploadPathPrefix,uploadFilename);
       File file=null;
       try {
           //上传文件
           file=File.createTempFile(uploadPath,null);
           //MultipartFile转file
           multipartFile.transferTo(file);
           PutObjectResult putObjectResult = cosManager.putPictureObject(uploadPath, file);
           //获取图片信息对象
           ImageInfo imageInfo = putObjectResult.getCiUploadResult().getOriginalInfo().getImageInfo();
           //封装返回结果
           int picWidth=imageInfo.getWidth();
           int picHeight=imageInfo.getHeight();
           double picScale= NumberUtil.round(picWidth*1.0 / picHeight*1.0,2).doubleValue();

           UploadPictureResult uploadPictureResult=new UploadPictureResult();
           uploadPictureResult.setUrl(cosClientConfig.getHost()+"/"+uploadPath);
           uploadPictureResult.setPicName(FileUtil.mainName(originalFilename));
           uploadPictureResult.setPicSize(FileUtil.size(file));
           uploadPictureResult.setPicWidth(picWidth);
           uploadPictureResult.setPicHeight(picHeight);
           uploadPictureResult.setPicScale(picScale);
           uploadPictureResult.setPicFormat(imageInfo.getFormat());
           //返回
           return uploadPictureResult;
       } catch (Exception e) {
           log.error("图片上传到对象存储失败",e);
           throw new BusinessException(ErrorCode.SYSTEM_ERROR,"上传失败");
       }finally {
           //临时文件清理
           deleteTempFile(file);
       }

   }



    /**
     * 校验文件
     * @param multipartFile
     */
    private void validPicture(MultipartFile multipartFile) {
        //判空
        ThrowUtils.throwIf(multipartFile == null, ErrorCode.PARAMS_ERROR, "文件不能为空");
        // 1. 校验文件大小
        long fileSize = multipartFile.getSize();
        ThrowUtils.throwIf(fileSize > 2 * ONE_M, ErrorCode.PARAMS_ERROR, "文件大小不能超过 2M");
        // 2. 校验文件后缀
        String fileSuffix = FileUtil.getSuffix(multipartFile.getOriginalFilename());
        // 允许上传的文件后缀
        ThrowUtils.throwIf(!ALLOW_FORMAT_LIST.contains(fileSuffix), ErrorCode.PARAMS_ERROR, "文件类型错误");
    }

    /**
     * 删除临时文件
     * @param file
     */
    public  void deleteTempFile(File file) {
        if (file !=null){
            //删除临时文件
            boolean deleteResult = file.delete();
            if (!deleteResult){
                log.error("file delete error,filepath={}",file.getAbsolutePath());
            }
        }
    }

    /**
     * 通过URL上传图片
     * @param fileUrl
     * @param uploadPathPrefix
     * @return
     */
    public UploadPictureResult uploadPictureByUrl(String fileUrl, String uploadPathPrefix) {
        // 校验图片
        // validPicture(multipartFile);
        validUrlPicture(fileUrl);
        // 图片上传地址
        String uuid = RandomUtil.randomString(16);
        //String originalFilename = multipartFile.getOriginalFilename();
        String originalFilename = FileUtil.mainName(fileUrl);
        String uploadFilename = String.format("%s_%s.%s", DateUtil.formatDate(new Date()), uuid,
                FileUtil.getSuffix(originalFilename));
        String uploadPath = String.format("/%s/%s", uploadPathPrefix, uploadFilename);
        File file = null;
        try {
            // 创建临时文件
            file = File.createTempFile(uploadPath, null);
            // multipartFile.transferTo(file);
            HttpUtil.downloadFile(fileUrl, file);
            PutObjectResult putObjectResult = cosManager.putPictureObject(uploadPath, file);
            // 上传图片
            //获取图片信息对象
            ImageInfo imageInfo = putObjectResult.getCiUploadResult().getOriginalInfo().getImageInfo();
            //封装返回结果
            int picWidth=imageInfo.getWidth();
            int picHeight=imageInfo.getHeight();
            double picScale= NumberUtil.round(picWidth*1.0 / picHeight*1.0,2).doubleValue();

            UploadPictureResult uploadPictureResult=new UploadPictureResult();
            uploadPictureResult.setUrl(cosClientConfig.getHost()+"/"+uploadPath);
            uploadPictureResult.setPicName(FileUtil.mainName(originalFilename));
            uploadPictureResult.setPicSize(FileUtil.size(file));
            uploadPictureResult.setPicWidth(picWidth);
            uploadPictureResult.setPicHeight(picHeight);
            uploadPictureResult.setPicScale(picScale);
            uploadPictureResult.setPicFormat(imageInfo.getFormat());
            //返回
            return uploadPictureResult;
        } catch (Exception e) {
            log.error("图片上传到对象存储失败", e);
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "上传失败");
        } finally {
            this.deleteTempFile(file);
        }
    }

    /**
     * 根据URL校验文件
     * @param fileUrl
     */
    private void validUrlPicture(String fileUrl) {
        //0、校验非空
        ThrowUtils.throwIf(StrUtil.isBlank(fileUrl), ErrorCode.PARAMS_ERROR, "文件地址不能为空");
        try {
            // 1. 验证 URL 格式  验证是否是合法的 URL
            new URL(fileUrl);
        } catch (MalformedURLException e) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "文件地址格式不正确");
        }
        // 2. 校验 URL 协议
        ThrowUtils.throwIf(!(fileUrl.startsWith("http://") || fileUrl.startsWith("https://")),
                ErrorCode.PARAMS_ERROR, "仅支持 HTTP 或 HTTPS 协议的文件地址");
        // 3. 发送 HEAD 请求以验证文件是否存在
        // 使用 try with resources 简化流程
        try (HttpResponse response = HttpUtil.createRequest(Method.HEAD, fileUrl).execute()) {
            // 未正常返回，无需执行其他判断
            if (response.getStatus() != HttpStatus.HTTP_OK) {
                return;
            }
            // 4. 文件存在，校验文件类型
            String contentType = response.header("Content-Type");
            //不为空，才校验是否合法，这样校验相对宽松
            if (StrUtil.isNotBlank(contentType)) {
                // 允许的图片类型
                final List<String> ALLOW_CONTENT_TYPES = Arrays.asList("image/jpeg", "image/jpg", "image/png", "image/webp");
                ThrowUtils.throwIf(!ALLOW_CONTENT_TYPES.contains(contentType.toLowerCase()),
                        ErrorCode.PARAMS_ERROR, "文件类型错误");
            }
            // 5. 校验文件大小
            String contentLengthStr = response.header("Content-Length");
            if (StrUtil.isNotBlank(contentLengthStr)) {
                try {
                    long contentLength = Long.parseLong(contentLengthStr);
                    ThrowUtils.throwIf(contentLength > ONE_M, ErrorCode.PARAMS_ERROR, "文件大小不能超过 2M");
                } catch (NumberFormatException e) {
                    throw new BusinessException(ErrorCode.PARAMS_ERROR, "文件大小格式错误");
                }
            }
        }
    }




}
